A flow guide structure for a pit-type carburizing furnace

Abstract

The utility model belongs to the technical field of heat treatment equipment, and relates to a flow guide structure for a pit carburizing furnace, including a furnace shell, a muffle and an air guide tube, wherein the furnace shell, the muffle and the air guide tube are all cylindrical and axially vertically arranged, and the furnace shell, the muffle and the air guide tube are all coaxially arranged, the muffle is arranged inside the furnace shell, the air guide tube is arranged inside the muffle, and a conical flow guide structure is arranged at the lower end of the air guide tube. The utility model adopts the design of the conical flow guide structure, and when the air guide tube is heated and expanded, the air duct area between the bottom muffle and the air guide tube will not be smaller than the air duct area in the middle and upper sections, so it will not affect the atmosphere in the furnace; at the same time, it can ensure that the airflow enters the workpiece from the furnace base evenly along the inclined flow guide direction, improve the air guide performance, and achieve the effect of uniform atmosphere in the furnace, which has the advantages of simple structure, stable and reliable, convenient and effective, and improves the effect of uniform atmosphere, and can ensure the uniformity of the workpiece infiltration layer and the uniformity of the infiltration layer depth.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat treatment equipment, and in particular relates to a flow guide structure for a well-type carburizing furnace. Background Art

[0002] At present, the air guide tubes and guide plates of the pit-type furnaces widely used in the field of workpiece heat treatment are all designed with flat bottoms perpendicular to the tube wall. When the pit-type furnace is used to heat treat the workpiece, when the air guide tube expands due to heat, the gap between the muffle and the air guide tube becomes smaller, and part of the gas flows away from the edge of the air guide tube, forming a gas short circuit, which makes it difficult to blow the atmosphere in the furnace cavity evenly to various surfaces inside and outside the workpiece, so that the circulation of the atmosphere (carbon, nitrogen, etc.) in the furnace cavity is not very uniform and forms a dead corner of the atmosphere circulation, which ultimately affects the uniformity of the workpiece carburization layer and makes the quality of the workpiece after processing vary. Utility Model Content

[0003] The purpose of the utility model is to solve the defects and shortcomings in the prior art and to design a guide structure for a well-type carburizing furnace which is simple in structure, stable and reliable, convenient and effective, improves the atmosphere uniformity effect, and ensures the uniformity of the workpiece carburizing layer and the uniformity of the carburizing layer depth.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a flow guide structure for a pit-type carburizing furnace, including a furnace shell, a muffle and an air guide tube, the furnace shell, the muffle and the air guide tube are all cylindrical and axially vertically arranged, the muffle is arranged inside the furnace shell, the air guide tube is arranged inside the muffle, and a conical flow guide structure is provided at the lower end of the air guide tube.

[0005] Preferably, the furnace shell, muffle and air guide tube are all coaxially arranged.

[0006] Preferably, a furnace lining is provided on the inner wall of the furnace shell, and a plurality of heating elements are evenly distributed on the furnace lining.

[0007] Preferably, the upper and lower ends of the furnace shell are respectively provided with a workpiece inlet and outlet and a furnace bottom mounting opening, the upper opening of the muffle is fixed to the workpiece inlet and outlet, and the lower opening of the muffle extends to below the furnace bottom mounting opening.

[0008] Preferably, both upper and lower ends of the air guide cylinder are provided with openings, and the conical flow guide structure is connected to the lower opening of the air guide cylinder.

[0009] Preferably, the conical air guide structure is designed in a conical cylindrical shape, the upper opening of which is correspondingly connected to the lower opening of the air guide tube, and the diameter of the lower opening is smaller than the diameter of the upper opening, and the surface is designed to be inclined.

[0010] After adopting the above technical solution, the flow guide structure for a pit-type carburizing furnace provided by the utility model has the following beneficial effects:

[0011] The utility model adopts the design of the conical guide structure. When the air guide tube expands due to heat, the air duct area between the bottom muffle and the air guide tube will not be smaller than the air duct area in the middle and upper sections, so it will not affect the atmosphere in the furnace; at the same time, it can ensure that the airflow enters the workpiece from the furnace base evenly along the inclined guide direction, improve the air guide performance, and achieve the effect of uniform atmosphere in the furnace. Therefore, the utility model has the advantages of simple structure, stable and reliable, convenient and effective, and improves the effect of uniform atmosphere, and can ensure the uniformity of the workpiece infiltration layer and the uniformity of the infiltration layer depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of a flow guide structure for a pit-type carburizing furnace of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the air guide tube in the utility model.

[0014] Among them: furnace shell 1, muffle 2, air guide tube 3, conical flow guide structure 4, furnace lining 5. DETAILED DESCRIPTION

[0015] The present invention is further described clearly and completely below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0017] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0018] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0019] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0020] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0021] The utility model discloses a flow guide structure for a well-type carburizing furnace, such as Figure 1-2 As shown, it includes a furnace shell 1, a muffle 2 and an air guide tube 3, the furnace shell 1, the muffle 2 and the air guide tube 3 are all cylindrical and axially vertically arranged. Specifically, the furnace shell 1, the muffle 2 and the air guide tube 3 are coaxially arranged, a furnace lining 5 is arranged on the inner wall of the furnace shell 1, and a plurality of heating elements are evenly distributed on the furnace lining 5. The upper and lower ends of the furnace shell 1 are respectively provided with a workpiece inlet and outlet and a furnace bottom installation opening, the muffle 2 is arranged inside the furnace shell 1, and the upper end opening of the muffle 2 is fixed to the workpiece inlet and outlet. The lower opening of the muffle 2 extends to below the furnace bottom mounting opening, the air guide tube 3 is arranged inside the muffle 2, and the lower end of the air guide tube 3 is provided with a conical flow guide structure 4. Specifically, the upper and lower ends of the air guide tube 3 are provided with openings, and the conical flow guide structure 4 is connected to the lower end opening of the air guide tube 3. The conical flow guide structure 4 is a conical cylindrical design, and its upper end opening is correspondingly connected to the lower end opening of the air guide tube 3, and the diameter of the lower end opening is smaller than the diameter of the upper end opening, and the surface is designed to be inclined.

[0022] When the flow guide structure of a well-type carburizing furnace of the utility model is in use, when the air guide tube 3 expands due to heat, the air duct area between the bottom muffle 2 and the air guide tube 3 will not be smaller than the air duct area in the middle and upper sections, that is, the air inlet between the muffle 2 and the air guide tube 3 will not become smaller, and therefore will not affect the atmosphere in the furnace; at the same time, the conical flow guide structure 4 guides the gas, and can ensure that the airflow evenly enters the workpiece from the furnace base along the inclined flow guide direction, thereby improving the air guide performance and achieving the effect of uniform atmosphere in the furnace.

[0023] To sum up, the utility model provides a flow guide structure for a pit-type carburizing furnace, which has the advantages of simple structure, stability and reliability, convenience and effectiveness, and can improve the uniformity of the atmosphere, ensure the uniformity of the workpiece carburizing layer and the uniformity of the carburizing layer depth, etc. It has great market value and is worthy of wide promotion and application.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flow guide structure for a pit carburizing furnace, characterized in that: The invention comprises a furnace shell (1), a muffle (2) and an air guide tube (3); the furnace shell (1), the muffle (2) and the air guide tube (3) are all cylindrical and axially vertically arranged; the muffle (2) is arranged inside the furnace shell (1); the air guide tube (3) is arranged inside the muffle (2); and a conical flow guide structure (4) is provided at the lower end of the air guide tube (3).

2. The flow guide structure for a pit type carburizing furnace according to claim 1, characterized in that: The furnace shell (1), the muffle (2) and the air guide tube (3) are all arranged coaxially.

3. The flow guide structure for a pit type carburizing furnace according to claim 1, characterized in that: A furnace lining (5) is provided on the inner wall of the furnace shell (1), and a plurality of heating elements are evenly distributed on the furnace lining (5).

4. The flow guide structure for a pit-type carburizing furnace according to claim 1, characterized in that: The furnace shell (1) is provided with a workpiece inlet and outlet and a furnace bottom mounting opening at the upper and lower ends respectively; the upper opening of the muffle (2) is fixed to the workpiece inlet and outlet, and the lower opening of the muffle (2) extends to below the furnace bottom mounting opening.

5. The flow guide structure for a pit type carburizing furnace according to claim 1, characterized in that: The upper and lower ends of the air guide cylinder (3) are both provided with openings, and the conical flow guide structure (4) is connected to the lower opening of the air guide cylinder (3).

6. The flow guide structure for a pit type carburizing furnace according to claim 1, characterized in that: The conical air guide structure (4) is designed in a conical cylindrical shape, the upper opening of which is correspondingly connected to the lower opening of the air guide cylinder (3), the diameter of the lower opening is smaller than the diameter of the upper opening, and the surface is designed in an inclined surface.

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